Baffle and end shield assembly for dynamoelectric machines



G. D. WILLITS June 27, 1950 mm N8 4 EWM mmm Y Irwventor: Gl'enrw D.Willits, by HIS Attovney Patented June 27, 1950 BAFFLE AND END SHIELD ASSEMBLY FOR DYNAMOELECTRIC MACHINES Glenn D. Willits, Grabill, Ind., assignor to General Electric Company, a corporation of New York Application December 30, 1948, Serial No. 68,224

8 Claims. 1

This invention relates to the assembly of a bailie in a container and more particularly to an improved battle and end shield assembly for fancooled dynamoelectric machines.

In the design of fan-ventilated dynamoelectric machines, particularly in the fractional horsepower frame sizes, it is desirable to provide an annular baffle for directing the cooling medium to the fan. Such baffle members have customarily been assembled on the end shield of the machine by means of screws or a press-fit. This arrangement, however, necessitates the complete assembly of the end shield, rotor, shaft, fan, and bafile prior to the positioning of the rotor in the stator and in addition, such a bafiie is difficult to remove. It is, therefore, desirable to provide a bafile which is readily assembled and disassembled and which will have a self-locking connection with the machine on the final assembly of the end shield to the stator shell.

An object of this invention is to provide an improved baffle mounting for containers.

Another object of this invention is to provide an improved baflie and end shield assembly for dynamoelectric machines.

I A further object of this invention is to provide an improved baffle and end shield assembly for dynamoelectric machines wherein the bafile is provided with a self-locking connection when the end shield is secured to the stator shell.

Further objects and advantages of this invention will become apparent and the invention will be better understood b reference to the following description and accompanying drawing. The features of novelty which characterize this invention will be distinctly pointed out in the claims annexed to and forming a part of this specification.

In accordance with this invention, an end shield is provided having an annular flange portion with a rabbet formed on the outer periphery thereof for aligning the end shield with the stator shell. The flange portion is provided with a plurality of slots in the edge thereof extending beyond the rabbet. An annular baffle member is positioned within the shell abutting the edge of the end shield. The bafile member has a plurality of spring ears formed from its outer portion and spaced from its outer periphery. These ears extend beyond the outer periphery of the bafiic member and are positioned in the slots in the edge of the end shield flange portion and bear against the end of the stator shell. Thus, the baille member is securely held in place by a selflocking connection when the end shield is secured to the stator shell.

In the drawing, Fig. 1 is a side elevational view, partly in section, illustrating the improved baffle and end shield assembly of this invention; Fig. 2 is a fragmentary view showing the relative positions of the outer periphery of the baffle member and the spring earsf Fig. 3 is an end view of the improved baffle member of Fig. 1; Fig. 4 is a cross sectional view taken along the lines 4-4 of Fig. 3; and Fig. 5 is a fragmentary view illustrating the slots in the edge of the flange ortion of the end shield member of Fig. 1.

Referring now to the drawing, there is shown a fractional horsepower dynamoelectric machine having a rotor member I mounted on a shaft 2. A stator member 3 surrounds the rotor member I and is mounted in a shell member 4. An end shield 5 is provided having an annular flange portion 6 with a rabbet portion 7 formed on its outer periphery for aligning the end shield with the stator shell 4. The end shield E is provided with a bearing 3 for rotatably supporting the extension 9 of the shaft 2. A bearing housing portion It is formed on the end shield 5 and defines with the bearing 8 a lubricant reservoir I I which is closed by a cup member I2. A lubricating wick I3 is fitted in a transverse opening I4 in the bearing 8 and serves to feed lubricant from the reservoir II to the shaft extension 9. The lubricant feedin wick I3 is resiliently urged onto the journal surface of the shaft extension 9 by the spring member IS. A lubricant thrower I 6 and a plurality of lubricant throwing grooves l6 formed on the shaft 2 serve to throw centrifugally, back into the reservoir II, the lubricant which travels along the shaft in the direction of the rotor I. Any lubricant which travels along the shaft in the opposite direction is thrown by a lubricant thrower I'I into the cavity I8 where it is returned to the reservoir II through a lubricant return passage I9. The cavit I8 is closed by a cap member 20 which is apertured to receive the shaft extension 9. A fan member 2| for ventilating the machine is positioned within the end shield 5 and is secured to the shaft 2.

In order to direct the cooling medium to the fan 2i, an annular baflie member 22 is provided. The baflie member 22 has a central opening 23 which is larger than the outside diameter of the rotor member I and smaller than the outside diameter of fan 2|. The annular portion of the baffle member 22 has a bowed cross section with the high portion 24 extending toward the end shield member 5. The baille member 22 is posijections or spring ears 2'5 formed from the outerportion of the baflie member. Holes 28 are provided in the bailie member 22 to receive throughbolts (not shown) which secure the end shield to the shell 5. The spring ears 2'! extend outward from the high portion of the bow Zd'and are spaced from the outer periphery of the bafile member 2!. The spring ears Z'l extend beyond the outer periphery of the baffle member 22 and are positioned in the slots extending into the space beyond the end of the shell it. Thus, when the baiile member 22 is positioned in the shell 4 and the end shield 5 is assembled on the shell, the spring ears 2? will bear against the end of the shellmember 4. It can now be readil seen that when the baflle member 22 and the end shield member 5 are assembled with the shell member 4, the edge 25 of the flange portion it of the end shield 55 is tending to force the bafile member 22 into the interior of the machine against the spring pressure of the spring ears 2? which bear against the end of the shell member 4. Thus, the bafile member 22 is securely held in place by a self-locking connection when the end shield member 5 is secured to the shell member i.

In the assembly of the end shield 5 and the baiile member 22, the stator member 3 with the shell member l secured thereto is preferably placed on end and the baffle member 22 is placed on the end of the shell member i, being supported thereon by the spring ears 26. In this position, the outer periphery of the baille member 22 will be Within the shell member i. The rotor member 5 mounted on the shaft 2 is then inserted through the opening 23 in the baffle member 22 and the fan 2! is secured to the shaft 2 on the exterior of the baiiie member. The end shield 5 is then slipped over the shaft extension 9 so that the spring ears 2! of the baiiie member 22 slide through the slots 25 of the flange portion 6. As the rabbet portion A of the end shield 5 is forced into engagement with the shell member t, the edge 25 bears against the baffle member 22 against the spring pressure of the spring ears 2? which are engaging the edge of the shell member ll. Thus, when the end shield 5 is secured to the shell member 4, the bafile member 22 is securely held in place by a self-locking connection. However, if it is desired to disassemble the end shield 5, the bafiie 22 does not remain affixed to either end shield 5 or the shell member i and can be readily removed.

It will now be readily seen that this invention provides an improved baiile and end shield assembly whereby the assembly and disassembly of the machine is greatly facilitated. It will also be readily apparent that this invention is not limited to a dynamoelectric machine and the improved baffle and end shield assembly can be utilized with any container having a closure.

While I have illustrated and described a specific embodiment of this invention, further modifications and improvements will occur to those skilled in the art. I desire that it be understood, therefore, that this invention is not limited to the 4 embodiment shown and I intend in the appended claims to cover all modifications within the spirit andscope of this invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a dynamoelectric machine comprising rotor member, a stator member, a shell member surrounding said stator member, and a fan for ventilating said dynamoelectric machine; an end shield member having an annular flange portion adapted to be secured to said shell member, said flange portion have a plurality of slots formed in the edge thereof, and an annular bafile member for guiding the cooling medium to said fan, said baflle member being positioned abutting said edge of said flange portion, said bafile member having a plurality of projections formed thereon spaced from the outer periphery thereof, said projections being positioned in said slots and bearing against the end of said shell member whereby said bafile member is securely held in place by a self-locking connection when said end shield is secured to said shell member.

2. In a dynamoelectric machine comprising a rotor member, a stator member, a shell member surrounding said stator member, and a fan for ventilating said dynamoelectric machine; an end shield member having an annular flange with a rabbet portion formed on its outer surface for aligning said endshield member with said shell member, said flange having a plurality ofslots formed in the edge thereof extending beyond said rabbet portion, and an annular baiiie member for guiding said cooling medium to said fan, said bafile member being positioned abutting said edge of said flange, said fbaiile member having a plurality of projections formed thereon spaced from the outer periphery thereof, said rojections being positioned in said slots and bearing against the end of said shell member whereby said b aille member is securely held in place by a self-locking connection when said end shield is securedto said shell member.

3. In a dynamoelectric machine comprising a rotor member, a stator member, a shell member surrounding said stator member, and a fan fon ventilating said dynamoelectric machine; an end. shield member having an annular flange with a, rabbet portion, formed on its outer surface for. aligning said end shield member with said shell member, said flange having a plurality of slots formed in the edge thereof extending beyond said rabbet portion, and an annular bafile member for guiding said cooling medium to said fan, said bafile member being positioned abutting said edge of said flange, said bafile member having a plurality of spring ears formed from the outer portion thereof spaced from the outer periphery of said baille member and extending beyond said outer periphery, said spring ears being positioned in said slots and bearing against the end of said shell member whereby said bafiie member is serotor member, a stator member, a shellmemberf surrounding said stator member, and a fan for ventilating said dynamoelectric machine; an end shield member having an annular flange with a' rabbet portion formed on its outer surface for aligning said end shield member with said shellmember, said flange having a plurality of slots formed in the edge thereof extending beyond said rabbet portion, and an annular baffle member for guiding said cooling medium to said fan, said baiiie member being positioned within said shell member and abutting said edge of said flange, said baille member having a plurality of spring ears formed from the outer portion thereof spaced from the outer periphery of said bafrle member and extending beyond said outer periphery, said spring ears being positioned in said slots and bearing against the end of said shell member whereby said baflle member is securely held in place by a self-locking connection when said end shield is secured to said shell member.

5. In a dynamoelectric machine comprising a rotor member, a stator member, a shell member surrounding said stator member, and a fan for ventilating said dynamoelectric machine; an end shield member having an annular flange with a rabbet portion formed on its outer surface for aligning said end shield member with said shell member, said flange having a plurality of slots formed in the edge thereof extending beyond said rabbet portion, and an annular baiile member for guiding said cooling medium to said fan, said baflle member having a central opening formed therein larger than the outside diameter or said rotor member and smaller than the outside diameter of said fan, said baffle member being positioned within said shell member and abutting said edge of said flange, said baffle member defining a cavity with said end shield member, said fan being positioned in said cavity, said baiile member having a plurality of spring ears formed from the outer portion thereof Spaced from the outer periphery of said baiile member and extending beyond said outer periphery, said spring ears being positioned in said slots and bearing against the end of said shell member whereby said baffie member is securely held in place by a self-locking connection when said end shield is secured to said shell member.

6. In a dynamoelectric machine comprising a rotor member, a stator member, a shell member surrounding said stator member, and a fan for ventilating said dynamoelectric machine; an end shield member having an annular flange with a rabbet portion formed on its outer surface for aligning said end shield member with said shell member, said flange having a plurality of slots formed in the edge thereof extending beyond said rabbet portion, and an annular baffle member for guiding said cooling medium to said fan, said baflie member having a central openin formed therein, the annular portion of said baffle member having a bowed cross section, said bafiie mem ber being positioned within said shell member and abutting said edge of said flange with said bowed section extending toward said end shield member, said baffle member having a plurality of spring ears extending outward from said bowed section spaced from the outer periphery of said bafile member and extending beyond said outer periphery, said spring ears being positioned in said slots and bearing against the end of said shell member whereby said bafile member is securely held in place in self-locking connection when said end shield is secured to said shell member.

'7. In combination, a shell member, a closure member having a flange portion adapted to be secured to said shell member, said flange portion having a plurality of slots formed in the edge thereof, and a bafiie member positioned abutting said edge of said flange portion, said baffle member having a plurality of deformable projections formed thereon spaced from the outer periphery thereof, said projections being positioned in said slots and bearing against the end of said shell member whereby said bailie member is securely held in place by a self-locking connection when said closure member is secured to said shell member.

8. In combination, a shell member, a closure member having a flange portion adapted to be secured to said shell member, said flange portion having a plurality of slots formed in the edge thereof, and a bafile member positioned abutting said edge of said flange portion, said bafile memher having a plurality of deformable projections formed thereon spaced from the outer periphery thereof, said projections being positioned in said slots and bearing against the end of said shell member whereby said baflle member is securely held in place solely as a. result of the tension due to the deformation of said projections when said closure member is secured to said shell member.

GLENN D. WILLITS.

REFERENCES CITED The following references are of record in th file of this patent:

UNITED STATES PATENTS Number Name Date 1,120,325 Miraldi Dec. 8, 1914 1,551,235 Carter Aug. 25, 1925 1,578,918 Powell Mar. 30, 1926 2,021,255 Eggleston Nov. 19, 1935 2,198,125 Nelson Apr. 23, 1940 

